71 Dart Instrument cluster
Read the post by 67Dart273 on my "Under dash short post" it has a link to a good explanation of why you want to bypass ammeter. The car I am working on now has had the connection at the firewall burn off and a previous owner had the power to ignition switch burn off at steering column connector. As wired from the factory all power must pass from the alternator through the bulkhead connection to ammeter then power leads branch off to ignition switch, horn relay, fuse panel and ignition switch before continuing back through the bulkhead connection to the starter relay and battery. All this current tends to heat up wires and connections until something ultimately fails.